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CryptoHack

A free, fun platform for learning modern cryptography

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Learn By Doing

Learn about modern cryptography by solving a series of interactive puzzles and challenges. Get to know the ciphers and protocols that secure the digital world by breaking them.

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Level Up

Earn points by solving challenges. Finish categories to earn trophies and gain levels to track your progress. Can you reach the top of the scoreboard?

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Fresh Challenges

We are constantly creating new challenges to keep your crypto knowledge up to date. Expect exciting brainteasers and whole new categories as the site continues to grow.

New Challenges
ECLCG (HITCON CTF) CTF Archive 0
Sus (ImaginaryCTF) CTF Archive 0
Share (HITCON CTF) CTF Archive 0
Leet Universe (ImaginaryCTF (Daily)) CTF Archive 0
Hyper512 (HITCON CTF) CTF Archive 0
Weekly Top Users
#1 IIJ_38_kiran 5175
#2 IIJ_42_mayank 5050
#3 IIJ_55_Qazi 5040
#4 IIJ_14_arman 4635
#5 IIJ_64_sangini 4605
Recent Solves
Modes of Operation Starter yepchaos
Finding Flags arash1314
Finding Flags husky_du
Modular Binomials moosesue
Modulus Inutilis pop_eax
Recent Solutions
Round Keys auric 0
Curveball infernosalex 0
Nothing Up My Sleeve reviselesson 0
Lo-Hi Card Game reviselesson 0
Greatest Common Divisor debrunbaix 0

Level Up

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